What are these?

These are MP3 recordings of an egg timer ticking for 25 minutes, and finally ringing at the end of that period. One of the MP3s has brown noise in the background because it helps me concentrate.

But why?

I love the Pomodoro time-management technique and use it whenever I need to buckle down and really work. At home, I like to time my pomodoros (1 pomodoro = 1 block of working time) with this fantastic cow-shaped egg timer because it makes a great ticking sound. The ticking tells me, It’s hammer time!